In a generic age-irrelevant view of the concept: someone who wouldn't or can't get himself to do what they know is the right thing to do.
Someone who likes someone else but wouldn't act upon it; simply cause they are too immature to do what normal people would do.
by s-bandt November 05, 2011
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an unwillingness to recognize, like those around you, that your head is up your rear end, and you like it there.
by deviant May 08, 2003
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Someone who thinks vulgar words are funny. Most children exhibit this behavior.
Child: I drew a butt! Ha ha ha! Me: That's not funny. That's immature.
by spel itt rite January 16, 2006
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someone who cannot control their emotional behavior
Some people can act immature when they feel they are attacked.
by Gerard Irick March 24, 2010
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by revisiting old posts we were able to witness the immaturation of the internet from a place of cordial dissent to whiny bickering.
by kris takahashi August 25, 2009
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Kids acting 16 and 17 nowadays show immaturity by acting like 12 year olds..
by capule August 24, 2007
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